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A pre-Sturtian depositional age of the lower Paraguay Belt, Western Brazil, and its relationship to western Gondwana magmatism

Manoel, Talitta Nunes; Selby, David; Galvez, Matthieu Emmanuel; Leite, Jayme Alfredo Dexheimer; Figueiredo, Luan Nonato

A pre-Sturtian depositional age of the lower Paraguay Belt, Western Brazil, and its relationship to western Gondwana magmatism Thumbnail


Authors

Talitta Nunes Manoel

David Selby

Matthieu Emmanuel Galvez

Jayme Alfredo Dexheimer Leite

Luan Nonato Figueiredo



Abstract

The Neoproterozoic Paraguay Belt in mid-eastern Mato Grosso, western Brazil, records the geological evolution of the margins of western Gondwana. The lack of absolute geochronology for the Paraguay Belt has hampered both regional and global stratigraphic correlations. Here we determine the depositional age for the Peresopolis black slate that belongs to the base of the Cuiabá Group in the Paraguay Belt using Re-Os geochronometry. We obtain a narrow Re-Os age interval of 784 ± 8 Ma and a juvenile initial 187Os/188Os composition (Osi) of 0.15 ± 0.03. These data indicate that the Peresopolis black slate is Tonian in age and was deposited in a basin strongly influenced by the weathering of juvenile material, and potentially linked to the early rifting of Rodinia on western Gondwana. These slates record a time interval that is poorly represented in Brazil and with few counterparts in other Neoproterozoic basins globally. As such, our work is a foundation for future geochemical correlations and paleoenvironmental reconstructions of this critical transition of Earth history in Brazil and elsewhere.

Citation

Manoel, T. N., Selby, D., Galvez, M. E., Leite, J. A. D., & Figueiredo, L. N. (2021). A pre-Sturtian depositional age of the lower Paraguay Belt, Western Brazil, and its relationship to western Gondwana magmatism. Gondwana Research, 89, 238-246. https://doi.org/10.1016/j.gr.2020.10.002

Journal Article Type Article
Acceptance Date Oct 10, 2020
Online Publication Date Oct 11, 2020
Publication Date 2021-01
Deposit Date Nov 12, 2020
Publicly Available Date Oct 11, 2021
Journal Gondwana Research
Print ISSN 1342-937X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 89
Pages 238-246
DOI https://doi.org/10.1016/j.gr.2020.10.002

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